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Adding a class for performing a navigator.share() operation on Windows,
and corresponding tests.

Originally committed as part of https://crrev.com/c/2443757, but
reverted due to test issues. Patchset 1 is a cherry pick of this
original change (reduced to the files relevant to this portion) for
easy comparison.

Bug: 1035527
Change-Id: I82a61739c168b0a2c9aa9f9f9d20572d8a45a2f7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2503819
Commit-Queue: Hoch Hochkeppel <mhochk@microsoft.com>
Reviewed-by: Eric Willigers <ericwilligers@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821806}